limbic system


Also found in: Dictionary, Thesaurus, Legal, Acronyms, Encyclopedia, Wikipedia.

system

 [sis´tem]
1. a set or series of interconnected or interdependent parts or entities (objects, organs, or organisms) that act together in a common purpose or produce results impossible by action of one alone.
2. an organized set of principles or ideas. adj., adj systemat´ic, system´ic.

The parts of a system can be referred to as its elements or components; the environment of the system is defined as all of the factors that affect the system and are affected by it. A living system is capable of taking in matter, energy, and information from its environment (input), processing them in some way, and returning matter, energy, and information to its environment as output.

An open system is one in which there is an exchange of matter, energy, and information with the environment; in a closed system there is no such exchange. A living system cannot survive without this exchange, but in order to survive it must maintain pattern and organization in the midst of constant change. Control of self-regulation of an open system is achieved by dynamic interactions among its elements or components. The result of self-regulation is referred to as the steady state; that is, a state of equilibrium. homeostasis is an assemblage of organic regulations that act to maintain steady states of a living organism.

A system can be divided hierarchically into subsystems, which can be further subdivided into sub-subsystems and components. A system and its environment could be considered as a unified whole for purposes of study, or a subsystem could be studied as a system. For example, the collection of glands in the endocrine system can be thought of as a system, each endocrine gland could be viewed as a system, or even specific cells of a single gland could be studied as a system. It is also possible to think of the human body as a living system and the endocrine system as a subsystem. The division of a system into a subsystem and its environment is dependent on the perspective chosen by the person studying a particular phenomenon.
Systems, subsystems, and suprasystems. Within the environment there are suprasystems, such as human society, and systems within the suprasystem, such as the educational and industrial systems and the health care delivery system. Within the health care delivery system are subsystems, such as the patient, family members, the nurse, the physician, and allied health care professionals and paraprofessionals.
alimentary system digestive system.
apothecaries' system see apothecaries' system.
autonomic nervous system see autonomic nervous system.
avoirdupois system see avoirdupois system.
behavioral system in the behavioral system model of nursing, the patterned, repetitive, and purposeful behaviors of an individual.
cardiovascular system the heart and blood vessels, by which blood is pumped and circulated through the body; see also circulatory system.
CD system (cluster designation) a system for classifying cell-surface markers expressed by lymphocytes based on a computer analysis of monoclonal antibodies against hla antigens, with antibodies having similar specificity characteristics being grouped together and assigned a number (CD1, CD2, CD3, etc.); these CD numbers are also applied to the specific antigens recognized by the various groups of monoclonal antibodies. See also CD antigen.
centimeter-gram-second system (CGS) (cgs) a system of measurements in which the units are based on the centimeter as the unit of length, the gram as the unit of mass, and the second as the unit of time.
central nervous system see central nervous system.
centrencephalic system the neurons in the central core of the brainstem from the thalamus to the medulla oblongata, connecting the cerebral hemispheres.
circulatory system see circulatory system.
client system in the general systems framework and theory of goal attainment, the composite of physiological, psychological, sociocultural, and developmental variables that make up the total person.
colloid system (colloidal system) colloid (def. 3).
conduction system (conductive system (of heart)) the system of atypical cardiac muscle fibers, comprising the sinoatrial and atrioventricular nodes, internodal tracts, atrioventricular bundle, bundle branch, and terminal ramifications into the Purkinje network.
digestive system see digestive system.
Emergency Medical Services (EMS) system a comprehensive program designed to provide services to the patient in the prehospital setting. The system is activated when a call is made to the EMS operator, who then dispatches an ambulance to the patient. The patient receives critical interventions and is stabilized at the scene. A communication system allows the health care workers at the scene to contact a trauma center for information regarding further treatment and disposition of the patient, followed by transportation of the patient to the most appropriate facility for treatment.
endocrine system the system of ductless glands and other structures that produce internal secretions (hormones) that are released directly into the circulatory system, influencing metabolism and other body processes; see endocrine glands.
environmental control system environmental control unit.
expert system a set of computer programs designed to serve as an aid in decision making.
extrapyramidal system see extrapyramidal system.
gateway system a software interface between an online searcher and one or more search systems, facilitating the use of the system by searchers who are unfamiliar with it, or with online retrieval in general.
genitourinary system the organs concerned with production and excretion of urine, together with the reproductive organs. (See Plates.) Called also urogenital system.
haversian system a haversian canal and its concentrically arranged lamellae, constituting the basic unit of structure in compact bone (osteon).
Haversian system: Structures of compact and spongy bone with the central haversian canal surrounded by the lamellae. From Applegate, 2000.
health care system see health care system.
heterogeneous system a system or structure made up of mechanically separable parts, as an emulsion or suspension.
His-Purkinje system the intraventricular conduction system from the bundle of His to the distal Purkinje fibers, which carries the impulse to the ventricles.
Home Health Care Classification system see home health care classification system.
homogeneous system a system or structure made up of parts that cannot be mechanically separated, as a solution.
hypophyseoportal system (hypophysioportal system) (hypothalamo-hypophysial portal system) the venules connecting the hypothalamus with the sinusoidal capillaries of the anterior lobe of the pituitary gland; they carry releasing substances to the pituitary.
immune system see immune system.
interpersonal system in the general systems framework and theory of goal attainment, two or more individuals interacting in a given situation.
lay health system a system comprising an informal referral network and sources of treatment outside the formal biomedical sources of health care; it includes individual consultation and information-seeking through significant others and peers concerning health behaviors, symptoms, and evaluation of treatment before, during, and after consultation with health care professionals.
legal system in the omaha system, anything connected with law or its administration; it includes legal aid, attorney, courts, or Child Protective Services (CPS), and many other agencies and officials.
limbic system a system of brain structures common to the brains of all mammals, comprising the phylogenetically old cortex (archipallium and paleopallium) and its primarily related nuclei. It is associated with olfaction, autonomic functions, and certain aspects of emotion and behavior.
lymphatic system see lymphatic system.
lymphoid system the lymphoid tissue of the body, collectively; it consists of primary (or central) lymphoid tissues, the bone marrow, and thymus, and secondary (or peripheral) tissues, the lymph nodes, spleen, and gut-associated lymphoid tissue (tonsils, Peyer's patches).
lymphoreticular system the lymphoid and reticuloendothelial systems considered together; see also lymphoreticular disorders.
metric system see metric system.
mononuclear phagocyte system the group of highly phagocytic cells that have a common origin from stem cells of the bone marrow and develop circulating monocytes and tissue macrophages, which develop from monocytes that have migrated to connective tissue of the liver (kupffer's cells), lung, spleen, and lymph nodes. The term has been proposed to replace reticuloendothelial system, which includes some cells of different origin and does not include all macrophages.
nervous system see nervous system.
nursing system in the self-care model of nursing, all the actions and interactions of nurses and patients in nursing practice situations; nursing systems fall into three categories: wholly compensatory, partly compensatory, and supportive-educative.
Omaha system see omaha system.
oxygen delivery system a device that delivers oxygen through the upper airways to the lungs at concentrations above that of ambient air. There are two general types: the fixed performance or high flow type, which can supply all of the needs of a patient for inspired gas at a given fractional inspired oxygen; and the variable performance or low flow type, which cannot supply all of the patient's needs for oxygen and delivers fractional inspired oxygen that varies with ventilatory demand.
parasympathetic nervous system see parasympathetic nervous system.
peripheral nervous system the portion of the nervous system consisting of the nerves and ganglia outside the brain and spinal cord.
personal system in the general systems framework and theory of goal attainment, the unified self, a complex whole that is rational, conscious, and feeling and that sets goals and decides on the means of achieving them.
pituitary portal system hypothalamo-hypophysial portal system.
portal system an arrangement by which blood collected from one set of capillaries passes through a large vessel or vessels and another set of capillaries before returning to the systemic circulation, as in the pituitary gland (the hypothalamo-hypophysial portal system) or the liver (the hepatic portal circulation).
renin-angiotensin-aldosterone system see renin-angiotensin-aldosterone system.
respiratory system the group of specialized organs whose specific function is to provide for the transfer of oxygen from the air to the blood and of waste carbon dioxide from the blood to the air. The organs of the system include the nose, the pharynx, the larynx, the trachea, the bronchi, and the lungs. See also respiration and Plates 7 and 8.
reticular activating system see reticular activating system.
reticuloendothelial system see reticuloendothelial system.
safety system see safety system.
SI system see SI units.
skeletal system see skeletal system.
social system in the general systems framework and theory of goal attainment, an organized boundary system of social roles, behaviors, and practices developed to maintain balance for growth, development, and performance, which involves an exchange of energy and information between the person and the environment for regulation and control of stressors.
support system in the omaha system, the circle of friends, family, and associates that provide love, care, and need gratification; it may include church, school, workplace, or other groupings.
sympathetic nervous system see sympathetic nervous system.
Unified Medical Language system see unified medical language system.
Unified Nursing Language system see unified nursing language system.
unit dose system a method of delivery of patient medications directly to the patient care unit. Following review by a nurse, a copy of the physician's original order is sent to the pharmacy, where the pharmacist reviews it again. The pharmacist then fills the order and delivers the medication to the patient care unit, usually in a 24-hour supply. Each patient has an individual supply of medications prepared and labeled by the pharmacist.
urinary system the system formed in the body by the kidneys, ureters, urinary bladder, and urethra, the organs concerned in the production and excretion of urine.
urogenital system genitourinary system.
vascular system circulatory system.
vasomotor system the part of the nervous system that controls the caliber of the blood vessels.

lim·bic sys·tem

collective term denoting a heterogeneous array of brain structures at or near the edge (limbus) of the medial wall of the cerebral hemisphere, in particular the hippocampus, amygdala, and fornicate gyrus; the term is often used so as to include also the interconnections of these structures, as well as their connections with the septal area, the hypothalamus, and a medial zone of mesencephalic tegmentum. By way of the latter connections, the limbic system exerts an important influence on the endocrine and autonomic motor systems; its functions also appear to affect motivational and mood states.
Synonym(s): visceral brain

limbic system

n.
A group of interconnected deep brain structures common to all mammals, including the hippocampus and amygdala, involved in olfaction, emotion, motivation, behavior, and various autonomic functions.

limbic system

Etymology: L, limbus, edge
a group of structures within the rhinencephalon of the brain that are associated with various emotions and feelings such as anger, fear, sexual arousal, pleasure, and sadness. The structures of the limbic system include the cingulate gyrus, the isthmus, the hippocampal gyrus, the uncus, and the amygdala. The structures connect with various other parts of the brain such as the septum and the hypothalamus. Unless the limbic system is modulated by other cortical areas, periodic attacks of uncontrollable rage may occur in some individuals. The function of the system is incompletely understood.
enlarge picture
Limbic system

limbic system

Neurology The 'peripheral' component of the CNS, which is linked to the autonomic nervous system and carries out the non-motor and non-sensory aspects of cerebral function, including control of emotion, eating, drinking, sexual activity, other behaviors, olfaction Components Olfactory system, hippocampus, dentate nucleus, cingulate gyri, amygdalus, septum, fornicate gyrus, parts of the thalamus and hypothalamus and connections with the septum, hypothalamus, and medial mesencephalic tegmentum; the LS controls autonomic activity–eg, changes in BP and respiration

lim·bic sys·tem

(lim'bik sis'tĕm)
Collective term denoting a heterogeneous array of brain structures at or near the edge (limbus) of the medial wall of the cerebral hemisphere, in particular the hippocampus, amygdala, and fornicate gyrus; the term is often used so as to include also the interconnections of these structures, as well as their connections with the septal area, the hypothalamus, and a medial zone of mesencephalic tegmentum. By way of the latter connections, the limbic system exerts an important influence on the endocrine and autonomic motor systems; its functions also appear to affect motivational and mood states.

limbic system

Enlarge picture
THE LIMBIC SYSTEM OF THE BRAIN
A group of brain structures, including the hippocampus, amygdala, dentate gyrus, cingulate gyrus, gyrus fornicatus, the archicortex, and their interconnections and connections with the hypothalamus, septal area, and a medial area of the mesencephalic tegmentum. The system is activated by motivated behavior and arousal, and it influences the endocrine glands and autonomic nervous system. See: illustration

limbic system

A centrally situated, ring-shaped structure in the brain consisting of a number of interconnected nerve cell nuclei. The limbic system represents much of what constitutes the brain in the lower mammals and is concerned with unconscious and automatic (autonomic) functions such as respiration, body temperature, hunger, thirst, wakefulness, sexual activity and their associated emotional reactions. Diseases of the limbic system cause emotional disturbances, and these can include emotional lability, forced or spasmodic laughing and crying, aggression, anger, violence, placidity, apathy, anxiety, fear, depression and diminished sexual interest.

limbic system

the HYPOTHALAMUS and the network of neurones which link it to the CEREBRAL CORTEX. The system is thought to be concerned with emotions and drives such as pleasure, hunger, thirst, pain, anger and sex, in vertebrate animals.

Limbic system

A group of structures in the brain that includes the hypothalamus, amygdala, and hippocampus. The limbic system plays an important part in regulation of human moods and emotions. Many psychiatric disorders are related to malfunctioning of the limbic system.
Mentioned in: Amnesia, Anxiety, Psychosurgery

limbic system

amygdala, hippocampus and gyrus fornicatus, with their hypothalamic connections which together appear to influence endocrine and autonomic motor function, mood and emotional state

limbic system (limˑ·bik sisˑ·tm),

n system of nuclei in the brain that modulates the mind's emotional tone, labels events as significant, adjusts motivation, encourages bonding, moderates libido, and filters events that are in the environment through the person's internal state of mind (also termed emotional coloring). Also involved in processing the sense of smell, storing powerful emotional memories, and controlling sleep cycles and appetite.
Enlarge picture
Limbic system.

lim·bic sys·tem

(lim'bik sis'tĕm)
Collective term denoting a heterogeneous array of brain structures at or near the edge (limbus) of the medial wall of the cerebral hemisphere, in particular the hippocampus, amygdala, and fornicate gyrus.

limbic system

(lim´bik),
n a group of structures within the rhinencephalon of the brain that are associated with various emotions and feelings, such as anger, fear, sexual arousal, pleasure, and sadness. Unless it is modulated by other cortical areas, periodic attacks of uncontrollable rage may occur in some individuals. The function of the system is poorly understood.

limbic

pertaining to a limbus, or margin.

limbic conjunctiva
the mucous membrane at the place of transition from corneal to conjunctival epithelium.
limbic system
a system of brain structures common to the brains of all mammals, comprising the phylogenetically old cortex (archipallium and paleopallium) and its primarily related nuclei. It is associated with olfaction, autonomic functions and certain aspects of emotion and behavior.
References in periodicals archive ?
Problem Solving Made Easy: The limbic system has hundreds of millions of nonlinear associations that are created and reformed constantly.
The limbic system is further connected to the orbital-frontal area of the cerebral cortex, Wernicke's area, the inferior parietal region, and the lateral prefrontal cortex.
In the cerebral cortex, these chemicals dull senses and distort thinking, perception, and judgment; in the cerebellum, they distort coordination, as well as balance and time perception; and in the limbic system, they can alter the brain's wiring for pleasurable experiences.
We want to understand why some brains are large, the developmental pattern in the limbic system and other things.
Early in adolescence, growth in the limbic system, the parts of the brain most directly involved in emotions, outstrips growth in the cerebral cortex, the part of the brain most responsible for reasoning.
Early neuroimaging studies in autism failed to prove the significance that the cerebellum and limbic system have on autistic behaviors.
Lemon balm acts on the limbic system to blunt the autonomic response to stress.
Sound stimulation of high frequency affects a part of the brain called the limbic system.
The limbic system comprises the deep parts of the temporal lobes (the lobes that are situated at the temples), nuclei called the amygdala, and some other areas.
The area of the brain concerned with smell is part of the mysterious limbic system, which is concerned with our instincts.
Neurobiologists will direct you to the limbic system, a golf ball-shaped mass in the center of the brain that includes portions of the lobes of the cerebral cortex, the thalamus and the hypothalamus.
These systems include the autonomic nervous system (ANS), limbic system, basal ganglia and extrathalamic cortical modulatory systems.